Handheld detector device



FIG. 1 is a front-left-bottom perspective view of a handheld detector device embodying the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a front-right-top perspective view thereof.

The broken lines in the figures depict portions of the handheld detector device and form no part of the claimed design. 

CLAIM The ornamental design for a handheld detector device, as shown and described. 